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1756-RM001B-EN-P, Using ControlLogix in SIL2 ... - Tuv-fs.com

1756-RM001B-EN-P, Using ControlLogix in SIL2 ... - Tuv-fs.com

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Preface 2Table Preface.1Section: Title: Description:Appendix CAdditional Information onHandl<strong>in</strong>g Faults <strong>in</strong> the<strong>ControlLogix</strong> SystemAdditional <strong>in</strong>formation that may help the userhandle faults.Appendix D Spurious Failure Estimates Spurious failure rates based on field returns.Appendix E Sample Probability of Failure Additional PFD calculations based on proof teston Demand (PFD) Calculations <strong>in</strong>tervals of 2 years and 4 years.Understand<strong>in</strong>g Term<strong>in</strong>ologyThe follow<strong>in</strong>g table def<strong>in</strong>es acronyms used <strong>in</strong> this manual.Table Preface.2 List of Acronyms Used Throughout the Safety Application ManualAcronym: Full Term: Def<strong>in</strong>ition:CIPControl andInformationProtocolA messag<strong>in</strong>g protocol used by Logix5000systems. It is a native <strong>com</strong>munications protocolused on ControlNet <strong>com</strong>munications networks,among others.DCDiagnosticCoverageThe ratio of the detected failure rate to the totalfailure rate.<strong>EN</strong> European Norm. The official European StandardGSV Get System Value A ladder logic output <strong>in</strong>struction that retrievesspecified controller status <strong>in</strong>formation and placesit <strong>in</strong> a dest<strong>in</strong>ation tag.MTBFMean Time Average time between failure occurrences.Between FailuresMTTRMean Time toRestorationAverage time needed to restore normal operationafter a failure has occurred.PADTPCPFDPFHProgramm<strong>in</strong>g andDebugg<strong>in</strong>g ToolPersonalComputerProbability ofFailure onDemandProbability ofFailure per HourRSLogix 5000 software used to program anddebug a <strong>SIL2</strong>-certified <strong>ControlLogix</strong> application.Computer used to <strong>in</strong>terface with, and control, a<strong>ControlLogix</strong> system via RSLogix 5000programm<strong>in</strong>g software.The average probability of a system to fail toperform its design function on demand.The probability of a system to have a dangerousfailure occur per hour.Publication <strong>1756</strong>-<strong>RM001B</strong>-<strong>EN</strong>-P - October 2003

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